jQuery.fn.rowspan = function(colIdx) { //合并相同的行
	return this.each(function() {
		var that;
		$('tr', this).each(function(row) {
			$('td:eq(' + colIdx + ')', this).filter(':visible').each(function(col) {
				if (that != null && $(this).html() == $(that).html()) {
					rowspan = $(that).attr("rowSpan");
					if (rowspan == undefined) {
						$(that).attr("rowSpan",1);
						rowspan = $(that).attr("rowSpan");
					}
					rowspan = Number(rowspan) + 1;
					$(that).attr("rowSpan",rowspan);
					$(this).hide();
				} else {
					that = this;
				}
			});
		});
	});
}